Janne Liljeblad recently announced the availability of yet another free, open-source non-linear video editor, called "Flowblade": http://code.google.com/p/flowblade/
Tutorial videos available on vimeo: Part 1 Part 2 Part 3.
Flowblade is based on the MLT framework (as also are kdenlive, OpenShot and Shotcut).
I only briefly tried it - may appeal to people that like the "Avid" user interface. I'll stay with kdenlive for now.
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